Thanks but no thanks. I'll keep my Bigma at 500mm, it is just fine wide open, and considering i only paid $1000 for it, much better deal than this Pentax lens. I can't imagine they will sell too many, even at $5000. I think they would have been better off with a 1xx-500mm good quality zoom, comparable to a Bigma, and priced it abour $1500-1800. would sell a lot more of them.